Two-faced needle and see the blood fly in the drug source, flavor attributed to the meridian, efficacy and main therapeutic areas, etc., need to be analyzed. 1. Drug source: two-faced needle from the rhizome of the plant two-faced needle of the genus pepper in the family of Rutaceae, see blood fly from the plant in the family of Rutaceae, prickly heterophyllous peppercorns of the root or root bark. 2. Characteristics and tastes of the two-faced needle: the taste of bitter, pungent, nature of the flat, a small poison, the stomach, liver meridian; see the blood fly taste pungent, slightly bitter, nature of the warm, to the liver, lung meridian. 3. Efficacy and Indications: Two-faced Needle has the efficacy of activating blood circulation and removing blood stasis (promoting blood circulation and eliminating blood stasis in the body), promoting qi circulation and relieving pain (relieving pain by regulating the body’s qi), dispelling wind and clearing the channels (dispelling wind evils and dredging the channels and channels), and detoxifying and subduing swellings, and it is used in treating bruises and injuries, stomachache, toothache, rheumatism and paralysis, and poisonous snake bites. Seeing Blood Fei has the efficacy of dispelling wind and dispersing cold (dispelling wind and dispelling cold), dispersing blood stasis, stopping bleeding and regenerating muscle, and is used for wind-cold-dampness paralysis (wind, cold and dampness three kinds of evils invade the human body leading to paralysis of the limbs), wind-cold cough, and bruises and injuries. Two-faced needle and see blood fly these two kinds of Chinese medicine in the use of adverse reactions and contraindications are still unclear, it is recommended to use under the guidance of a doctor, avoid unauthorized use of medication, so as to avoid adverse consequences.